Form for concrete work



June 22,1948. A, c. wan: 2,443,846

FORMiFOR CONCRETE WORKS Filed Oct. 23, 1946 wail/Zr.

Patented June 22, 1948 NT OFFICE FORM FOR CONCRETE WORK Alfred Charles White, Lowell, Mass.

Application October 23, 1946, SerialNo. 705,037

This invention comprises a new and improved metal form for use primarily in molding fire stops in frame houses, but is adapted to be used whereever it is desired to place concrete bodies between spaced floor timbers or the like. I

The concrete fire stopping required by building ordinances in many cities and towns has been heretofore constructed with the assistance of wooden forms which have been placed individually between the floor timbers and generally over the sills or girders of the floor. A set of these wooden forms for a dwelling house of moderate size frequently requires 700 board feet of lumber and 72 hours of carpenter work. An object of the present invention is to provide adjustable sheet metal forms that may be conveniently and rapidly placed, which are adjustable for variations in spacing of the floor timbers, and which may be removed and used over and over again as soon as the concrete body has set. The novel form of my construction achieves these advantages. A set of 100 forms is adequate for use in the construction of a house and the forms may be set in place and removed in not over 4 hours in all. My invention, therefore, is not only of great importance in saving labor, but it results in a substantial saving of material and in the production of the fire stopping of improved quality.

In one aspect the form of my invention comprises a pair of complemental sheet metal members having flanged sliding connection with each other whereby the effective width of the form may be adjusted, and each having a laterally projecting ear whereby the form as a whole may be suspended between adjacent floor timbers.

These and other features and advantages of the invention will be best understood and appreelated from the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawing in which the figure is a view in perspective showing the form in place between the floor timbers of a building, portions being broken away to show more clearly the concrete stopping.

While the precise location of the form in a building is of secondary importance, it is herein shown as secured in place between parallel floor timbers I and II which rest at their ends upon a sill I2. The timbers I0 and I I may be spaced 12" to 14" apart, for example, and may be 2 x 9" in cross-section. The space at the end of the timbers I0 and II is closed by sheathing I3. It is in this space between the timbers I U and I I, above the sill I2 and within the sheathing I3, that it is 3 Claims. (Cl. --118) 2 desired to mold a rectangular concrete block" M which constitutes fire stopping.

The form of my invention as herein shown comprises a pair of complemental sheet metal members. The left hand member I5, shown in the accompanying figure, has a laterally projecting ear I6 at its upper left hand corner, this being arranged to overlap the timber I0 and so suspend the form in the space between the timbers I0 and II. The member I5 has a guide flange I'I formed in its upper edge and a corresponding guide flange l8 formed in its lower edge. Along its left hand vertical edge it is provided with a right angle flange I9 perforated so that it may be nailed temporarily to the inner face of the timber Ill thus maintaining the form in the proper location and in vertical position,

The other member 20 of the form is provided with a laterally projectin ear 2I at its upper right hand corner as seen in the figure of the drawing, arranged to overlap the timber II and cooperate with the ear I6 in locating the form as a whole. It is also provided along its right hand vertical edge with a right angle flange 22 perforated and adapted to be secured to the inner face of the timber II corresponding to the flange I9. The upper and lower edges of the member 20 are slidingly received within the guide flanges I1 and I8 of the member I5. It will be apparent that the effective width of the form as a whole may be readily adjusted by merely telescopin together the two component members of the form. The member 20 is provided in its inner vertical edge with a reinforcing flange 23. This flange is flattened at bothends so that it will slide freely within the guide flanges I7 and I8 of the member I5. It serves not only to stiffen the member 20 in which it is formed but the assembled members as located in operative position.

It will be apparent that in use the form may be suspended by the ears I6 and 2| on adjacent floor timbers, spread apart to flt the width of the timbers in the particular location, adjusted along the timbers so as to form a rectangular mold space of the right dimensions in association with the siding I3, and then secured firmly in place by nails driven through the flanges I9 and 22 into the floor timbers. Concrete is now poured in the space thus formed in the shape of the block I4. It will be noted that the two form members I5 and 20 present a susbtantially smooth face against the concrete, while the guide flanges I1 and I 8, the reinforcing flange 23, and the attaching flanges I9 and 22 all project from the rear or outer side of the form. After the concrete has set, the attaching nails may be pulled from the flanges l9 and 22, the form collapsed and removed from its position in readiness for further use in a new location.

Having thus disclosed my invention, I claim as new and desire to secure by Letters Patent:

1. A form for use in molding fire stops, comprising a pair of complemental sheet steel members having flanged sliding connection with each other whereby the effective width of the form may be adjusted, means for suspending theform between adjacent floor timbers, and a right angle flange on the outer edge of each member adapted to be nailed to the face of the floor timber from which the member is suspended. v p

2. An adjustable form for use in molding fire stops in frame houses, comprising complemental sheet metal pieces each having a laterally projecting ear at its upper and outer corner and a vertical right angular flange extending along its outer edge beneath its said ear, one of said pieces having guide flanges at its upper and lower edges in which the other piece is slidingly received in overlapping relation, and said other piece having a stiflening flange in its inner edge which of a building.

ALFRED CHARLES WHITE.

1 REFERENCES CITED The following references are of record in the file r this patent:

UNITED STATES PATENTS Number Name Date 1,131,840 Hunt Mar. 16, 1915 1,616,354 Comer et a1. Feb. 1, 1927 1,246,404 Dunning Nov. 13, 1917 Bunker Feb. 1, 1927 

